The Calgary-based company now has "approximately 500,000 barrels per day of firm, 20-year commitments,” according to a statement on Thursday. The pipeline operator will continue to secure additional volumes.

The announcement marks yet another hurdle overcome for the project, first proposed in 2008. In November, TransCanada received state approval in Nebraska to construct the project there using an alternate route, a decision that may spur added legal action by foes who say the new path hasn’t received the same review as the original plan.

Meanwhile, the company said in its statement it is working with landowners along the new path to obtain the necessary easements. Construction preparation has begun, the company said, with primary work potentially coming in 2019.

“Over the last 12 months, the Keystone XL project has achieved several milestones that move us significantly closer to constructing this critical energy infrastructure for North America," Russ Girling, TransCanada’s chief executive officer, said in the statement.

Keystone XL would be a victory for Canadian oil sands producers who are facing transportation bottlenecks getting their crude to market.

The pipeline would ship 830,000 barrels of crude a day from Hardisty, Alberta, through Montana and South Dakota to Nebraska, where it would connect to TransCanada’s existing Keystone system that carries crude to the U.S. Gulf Coast hub of refineries and export terminals.

The statement didn’t say that a final decision has been made by the company to proceed and Terry Cunha, a spokesman for TransCanada, didn’t immediately respond to a request for comment.

Keystone XL drew fierce opposition from environmentalists concerned about climate change and landowners along the path in Nebraska. Former President Barack Obama rejected TransCanada’s application in 2015, saying that it wasn’t in the national interest. That decision was reversed by the Trump administration.